1991

Committed 27 Sep 2023 06:06PM UTC coverage: 60.278% (+0.05%) from 60.226%

Build # 1991

Build Type

push

buildkite

Committed by

web-flow

Commit Message

fixed bug: Added alreadyStarted workflow case (#853)

If we get WorkflowExecutionAlreadyStartedError while starting workflow in new domain, then we don't require startWorkflowInNew domain again as well as not throw error. Hence, we will inform by giving status as "Workflow already started".

Run Details

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84.16

/src/main/java/com/uber/cadence/internal/testservice/TestWorkflowMutableStateImpl.java

/*
 *  Copyright 2012-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 *  Modifications copyright (C) 2017 Uber Technologies, Inc.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"). You may not
 *  use this file except in compliance with the License. A copy of the License is
 *  located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 *  or in the "license" file accompanying this file. This file is distributed on
 *  an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 *  express or implied. See the License for the specific language governing
 *  permissions and limitations under the License.
 */

package com.uber.cadence.internal.testservice;

import com.cronutils.model.Cron;
import com.cronutils.model.CronType;
import com.cronutils.model.definition.CronDefinition;
import com.cronutils.model.definition.CronDefinitionBuilder;
import com.cronutils.model.time.ExecutionTime;
import com.cronutils.parser.CronParser;
import com.google.common.base.Strings;
import com.google.common.base.Throwables;
import com.uber.cadence.ActivityTaskScheduledEventAttributes;
import com.uber.cadence.BadRequestError;
import com.uber.cadence.CancelTimerDecisionAttributes;
import com.uber.cadence.CancelTimerFailedEventAttributes;
import com.uber.cadence.CancelWorkflowExecutionDecisionAttributes;
import com.uber.cadence.ChildWorkflowExecutionCanceledEventAttributes;
import com.uber.cadence.ChildWorkflowExecutionCompletedEventAttributes;
import com.uber.cadence.ChildWorkflowExecutionFailedEventAttributes;
import com.uber.cadence.ChildWorkflowExecutionStartedEventAttributes;
import com.uber.cadence.ChildWorkflowExecutionTimedOutEventAttributes;
import com.uber.cadence.CompleteWorkflowExecutionDecisionAttributes;
import com.uber.cadence.ContinueAsNewWorkflowExecutionDecisionAttributes;
import com.uber.cadence.Decision;
import com.uber.cadence.DecisionTaskFailedCause;
import com.uber.cadence.EntityNotExistsError;
import com.uber.cadence.EventType;
import com.uber.cadence.FailWorkflowExecutionDecisionAttributes;
import com.uber.cadence.HistoryEvent;
import com.uber.cadence.InternalServiceError;
import com.uber.cadence.MarkerRecordedEventAttributes;
import com.uber.cadence.PollForActivityTaskRequest;
import com.uber.cadence.PollForActivityTaskResponse;
import com.uber.cadence.PollForDecisionTaskRequest;
import com.uber.cadence.PollForDecisionTaskResponse;
import com.uber.cadence.QueryConsistencyLevel;
import com.uber.cadence.QueryFailedError;
import com.uber.cadence.QueryRejectCondition;
import com.uber.cadence.QueryRejected;
import com.uber.cadence.QueryResultType;
import com.uber.cadence.QueryTaskCompletedType;
import com.uber.cadence.QueryWorkflowRequest;
import com.uber.cadence.QueryWorkflowResponse;
import com.uber.cadence.RecordActivityTaskHeartbeatResponse;
import com.uber.cadence.RecordMarkerDecisionAttributes;
import com.uber.cadence.RequestCancelActivityTaskDecisionAttributes;
import com.uber.cadence.RequestCancelActivityTaskFailedEventAttributes;
import com.uber.cadence.RequestCancelExternalWorkflowExecutionDecisionAttributes;
import com.uber.cadence.RequestCancelWorkflowExecutionRequest;
import com.uber.cadence.RespondActivityTaskCanceledByIDRequest;
import com.uber.cadence.RespondActivityTaskCanceledRequest;
import com.uber.cadence.RespondActivityTaskCompletedByIDRequest;
import com.uber.cadence.RespondActivityTaskCompletedRequest;
import com.uber.cadence.RespondActivityTaskFailedByIDRequest;
import com.uber.cadence.RespondActivityTaskFailedRequest;
import com.uber.cadence.RespondDecisionTaskCompletedRequest;
import com.uber.cadence.RespondDecisionTaskFailedRequest;
import com.uber.cadence.RespondQueryTaskCompletedRequest;
import com.uber.cadence.RetryPolicy;
import com.uber.cadence.ScheduleActivityTaskDecisionAttributes;
import com.uber.cadence.SignalExternalWorkflowExecutionDecisionAttributes;
import com.uber.cadence.SignalExternalWorkflowExecutionFailedCause;
import com.uber.cadence.SignalWorkflowExecutionRequest;
import com.uber.cadence.StartChildWorkflowExecutionDecisionAttributes;
import com.uber.cadence.StartChildWorkflowExecutionFailedEventAttributes;
import com.uber.cadence.StartTimerDecisionAttributes;
import com.uber.cadence.StartWorkflowExecutionRequest;
import com.uber.cadence.StickyExecutionAttributes;
import com.uber.cadence.TimeoutType;
import com.uber.cadence.UpsertWorkflowSearchAttributesDecisionAttributes;
import com.uber.cadence.UpsertWorkflowSearchAttributesEventAttributes;
import com.uber.cadence.WorkflowExecution;
import com.uber.cadence.WorkflowExecutionAlreadyCompletedError;
import com.uber.cadence.WorkflowExecutionCloseStatus;
import com.uber.cadence.WorkflowExecutionContinuedAsNewEventAttributes;
import com.uber.cadence.WorkflowExecutionSignaledEventAttributes;
import com.uber.cadence.WorkflowQuery;
import com.uber.cadence.WorkflowQueryResult;
import com.uber.cadence.internal.common.WorkflowExecutionUtils;
import com.uber.cadence.internal.testservice.StateMachines.Action;
import com.uber.cadence.internal.testservice.StateMachines.ActivityTaskData;
import com.uber.cadence.internal.testservice.StateMachines.ChildWorkflowData;
import com.uber.cadence.internal.testservice.StateMachines.DecisionTaskData;
import com.uber.cadence.internal.testservice.StateMachines.SignalExternalData;
import com.uber.cadence.internal.testservice.StateMachines.State;
import com.uber.cadence.internal.testservice.StateMachines.TimerData;
import com.uber.cadence.internal.testservice.StateMachines.WorkflowData;
import com.uber.cadence.internal.testservice.TestWorkflowStore.TaskListId;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.time.Duration;
import java.time.Instant;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.OptionalLong;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.LongSupplier;
import org.apache.thrift.TException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class TestWorkflowMutableStateImpl implements TestWorkflowMutableState {

  @FunctionalInterface
  private interface UpdateProcedure {

    void apply(RequestContext ctx)
        throws InternalServiceError, BadRequestError, EntityNotExistsError;
  }

  private static final Logger log = LoggerFactory.getLogger(TestWorkflowMutableStateImpl.class);

  private final Lock lock = new ReentrantLock();
  private final SelfAdvancingTimer selfAdvancingTimer;
  private final LongSupplier clock;
  private final ExecutionId executionId;
  private final Optional<TestWorkflowMutableState> parent;
  private final OptionalLong parentChildInitiatedEventId;
  private final TestWorkflowStore store;
  private final TestWorkflowService service;
  private final StartWorkflowExecutionRequest startRequest;
  private long nextEventId;
  private final List<RequestContext> concurrentToDecision = new ArrayList<>();
  private final Map<String, StateMachine<ActivityTaskData>> activities = new HashMap<>();
  private final Map<Long, StateMachine<ChildWorkflowData>> childWorkflows = new HashMap<>();
  private final Map<String, StateMachine<TimerData>> timers = new HashMap<>();
  private final Map<String, StateMachine<SignalExternalData>> externalSignals = new HashMap<>();
  private StateMachine<WorkflowData> workflow;
  private volatile StateMachine<DecisionTaskData> decision;
  private long lastNonFailedDecisionStartEventId;
  private final Map<String, CompletableFuture<QueryWorkflowResponse>> queries =
      new ConcurrentHashMap<>();
  private final Map<String, PollForDecisionTaskResponse> queryRequests = new ConcurrentHashMap<>();
  private final Map<String, WorkflowQuery> pendingQueries = new ConcurrentHashMap<>();
  private final Optional<String> continuedExecutionRunId;
  public StickyExecutionAttributes stickyExecutionAttributes;

  /**
   * @param retryState present if workflow is a retry
   * @param backoffStartIntervalInSeconds
   * @param parentChildInitiatedEventId id of the child initiated event in the parent history
   */
  TestWorkflowMutableStateImpl(
      StartWorkflowExecutionRequest startRequest,
      Optional<RetryState> retryState,
      int backoffStartIntervalInSeconds,
      byte[] lastCompletionResult,
      Optional<TestWorkflowMutableState> parent,
      OptionalLong parentChildInitiatedEventId,
      Optional<String> continuedExecutionRunId,
      TestWorkflowService service,
      TestWorkflowStore store) {
    this.startRequest = startRequest;
    this.parent = parent;
    this.parentChildInitiatedEventId = parentChildInitiatedEventId;
    this.continuedExecutionRunId = continuedExecutionRunId;
    this.service = service;
    String runId = UUID.randomUUID().toString();
    this.executionId =
        new ExecutionId(startRequest.getDomain(), startRequest.getWorkflowId(), runId);
    this.store = store;
    selfAdvancingTimer = store.getTimer();
    this.clock = selfAdvancingTimer.getClock();
    WorkflowData data =
        new WorkflowData(
            retryState,
            backoffStartIntervalInSeconds,
            startRequest.getCronSchedule(),
            lastCompletionResult,
            runId, // Test service doesn't support reset. Thus originalRunId is always the same as
            // runId.
            continuedExecutionRunId);
    this.workflow = StateMachines.newWorkflowStateMachine(data);
  }

  private void update(UpdateProcedure updater)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    StackTraceElement[] stackTraceElements = Thread.currentThread().getStackTrace();
    update(false, updater, stackTraceElements[2].getMethodName());
  }

  private void completeDecisionUpdate(UpdateProcedure updater, StickyExecutionAttributes attributes)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    StackTraceElement[] stackTraceElements = Thread.currentThread().getStackTrace();
    stickyExecutionAttributes = attributes;
    update(true, updater, stackTraceElements[2].getMethodName());
  }

  private void update(boolean completeDecisionUpdate, UpdateProcedure updater, String caller)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    String callerInfo = "Decision Update from " + caller;
    lock.lock();
    LockHandle lockHandle = selfAdvancingTimer.lockTimeSkipping(callerInfo);

    try {
      checkCompleted();
      boolean concurrentDecision =
          !completeDecisionUpdate
              && (decision != null && decision.getState() == StateMachines.State.STARTED);

      RequestContext ctx = new RequestContext(clock, this, nextEventId);
      updater.apply(ctx);
      setPendingQueries(ctx);
      if (concurrentDecision && workflow.getState() != State.TIMED_OUT) {
        concurrentToDecision.add(ctx);
        ctx.fireCallbacks(0);
        store.applyTimersAndLocks(ctx);
      } else {
        nextEventId = ctx.commitChanges(store);
      }
    } catch (InternalServiceError
        | EntityNotExistsError
        | WorkflowExecutionAlreadyCompletedError
        | BadRequestError e) {
      throw e;
    } catch (Exception e) {
      throw new InternalServiceError(Throwables.getStackTraceAsString(e));
    } finally {
      lockHandle.unlock();
      lock.unlock();
    }
  }

  private void setPendingQueries(RequestContext ctx) {
    TestWorkflowStore.DecisionTask decisionTask = ctx.getDecisionTask();
    if (decisionTask != null) {
      decisionTask.getTask().setQueries(new HashMap<>(pendingQueries));
    }
  }

  @Override
  public ExecutionId getExecutionId() {
    return executionId;
  }

  @Override
  public Optional<WorkflowExecutionCloseStatus> getCloseStatus() {
    switch (workflow.getState()) {
      case NONE:
      case INITIATED:
      case STARTED:
      case CANCELLATION_REQUESTED:
        return Optional.empty();
      case FAILED:
        return Optional.of(WorkflowExecutionCloseStatus.FAILED);
      case TIMED_OUT:
        return Optional.of(WorkflowExecutionCloseStatus.TIMED_OUT);
      case CANCELED:
        return Optional.of(WorkflowExecutionCloseStatus.CANCELED);
      case COMPLETED:
        return Optional.of(WorkflowExecutionCloseStatus.COMPLETED);
      case CONTINUED_AS_NEW:
        return Optional.of(WorkflowExecutionCloseStatus.CONTINUED_AS_NEW);
    }
    throw new IllegalStateException("unreachable");
  }

  @Override
  public StartWorkflowExecutionRequest getStartRequest() {
    return startRequest;
  }

  @Override
  public StickyExecutionAttributes getStickyExecutionAttributes() {
    return stickyExecutionAttributes;
  }

  @Override
  public Optional<TestWorkflowMutableState> getParent() {
    return parent;
  }

  @Override
  public void startDecisionTask(
      PollForDecisionTaskResponse task, PollForDecisionTaskRequest pollRequest)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    if (task.getQuery() == null) {
      update(
          ctx -> {
            long scheduledEventId = decision.getData().scheduledEventId;
            decision.action(StateMachines.Action.START, ctx, pollRequest, 0);
            ctx.addTimer(
                startRequest.getTaskStartToCloseTimeoutSeconds(),
                () -> timeoutDecisionTask(scheduledEventId),
                "DecisionTask StartToCloseTimeout");
          });
    }
  }

  @Override
  public void completeDecisionTask(int historySize, RespondDecisionTaskCompletedRequest request)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    List<Decision> decisions = request.getDecisions();
    completeDecisionUpdate(
        ctx -> {
          if (request.getQueryResultsSize() > 0) {
            request
                .getQueryResults()
                .forEach(
                    (queryId, queryResult) -> {
                      completeQuery(queryId, queryResult);
                      pendingQueries.remove(queryId);
                    });
          }

          if (ctx.getInitialEventId() != historySize + 1) {
            throw new BadRequestError(
                "Expired decision: expectedHistorySize="
                    + historySize
                    + ","
                    + " actualHistorySize="
                    + ctx.getInitialEventId());
          }
          long decisionTaskCompletedId = ctx.getNextEventId() - 1;
          // Fail the decision if there are new events and the decision tries to complete the
          // workflow
          if (!concurrentToDecision.isEmpty() && hasCompleteDecision(request.getDecisions())) {
            RespondDecisionTaskFailedRequest failedRequest =
                new RespondDecisionTaskFailedRequest()
                    .setCause(DecisionTaskFailedCause.UNHANDLED_DECISION)
                    .setIdentity(request.getIdentity());
            decision.action(Action.FAIL, ctx, failedRequest, decisionTaskCompletedId);
            for (RequestContext deferredCtx : this.concurrentToDecision) {
              ctx.add(deferredCtx);
            }
            this.concurrentToDecision.clear();

            // Reset sticky execution attributes on failure
            stickyExecutionAttributes = null;
            scheduleDecision(ctx);
            return;
          }
          if (decision == null) {
            throw new EntityNotExistsError("No outstanding decision");
          }
          decision.action(StateMachines.Action.COMPLETE, ctx, request, 0);
          for (Decision d : decisions) {
            processDecision(ctx, d, request.getIdentity(), decisionTaskCompletedId);
          }
          for (RequestContext deferredCtx : this.concurrentToDecision) {
            ctx.add(deferredCtx);
          }
          lastNonFailedDecisionStartEventId = this.decision.getData().startedEventId;
          this.decision = null;
          boolean completed =
              workflow.getState() == StateMachines.State.COMPLETED
                  || workflow.getState() == StateMachines.State.FAILED
                  || workflow.getState() == StateMachines.State.CANCELED;
          if (!completed
              && ((ctx.isNeedDecision() || !this.concurrentToDecision.isEmpty())
                  || request.isForceCreateNewDecisionTask())) {
            scheduleDecision(ctx);
          }
          this.concurrentToDecision.clear();
          ctx.unlockTimer();
        },
        request.getStickyAttributes());
  }

  private void completeQuery(String queryId, WorkflowQueryResult queryResult) {
    CompletableFuture<QueryWorkflowResponse> future = queries.get(queryId);
    if (future == null) {
      throw new RuntimeException("Unknown query id: " + queryId);
    }
    if (queryResult.getResultType() == QueryResultType.ANSWERED) {
      future.complete(new QueryWorkflowResponse().setQueryResult(queryResult.getAnswer()));
    } else {
      future.completeExceptionally(
          new QueryFailedError().setMessage(queryResult.getErrorMessage()));
    }
  }

  private boolean hasCompleteDecision(List<Decision> decisions) {
    for (Decision d : decisions) {
      if (WorkflowExecutionUtils.isWorkflowExecutionCompleteDecision(d)) {
        return true;
      }
    }
    return false;
  }

  private void processDecision(
      RequestContext ctx, Decision d, String identity, long decisionTaskCompletedId)
      throws BadRequestError, InternalServiceError {
    switch (d.getDecisionType()) {
      case CompleteWorkflowExecution:
        processCompleteWorkflowExecution(
            ctx,
            d.getCompleteWorkflowExecutionDecisionAttributes(),
            decisionTaskCompletedId,
            identity);
        break;
      case FailWorkflowExecution:
        processFailWorkflowExecution(
            ctx, d.getFailWorkflowExecutionDecisionAttributes(), decisionTaskCompletedId, identity);
        break;
      case CancelWorkflowExecution:
        processCancelWorkflowExecution(
            ctx, d.getCancelWorkflowExecutionDecisionAttributes(), decisionTaskCompletedId);
        break;
      case ContinueAsNewWorkflowExecution:
        processContinueAsNewWorkflowExecution(
            ctx,
            d.getContinueAsNewWorkflowExecutionDecisionAttributes(),
            decisionTaskCompletedId,
            identity);
        break;
      case ScheduleActivityTask:
        processScheduleActivityTask(
            ctx, d.getScheduleActivityTaskDecisionAttributes(), decisionTaskCompletedId);
        break;
      case RequestCancelActivityTask:
        processRequestCancelActivityTask(
            ctx, d.getRequestCancelActivityTaskDecisionAttributes(), decisionTaskCompletedId);
        break;
      case StartTimer:
        processStartTimer(ctx, d.getStartTimerDecisionAttributes(), decisionTaskCompletedId);
        break;
      case CancelTimer:
        processCancelTimer(ctx, d.getCancelTimerDecisionAttributes(), decisionTaskCompletedId);
        break;
      case StartChildWorkflowExecution:
        processStartChildWorkflow(
            ctx, d.getStartChildWorkflowExecutionDecisionAttributes(), decisionTaskCompletedId);
        break;
      case SignalExternalWorkflowExecution:
        processSignalExternalWorkflowExecution(
            ctx, d.getSignalExternalWorkflowExecutionDecisionAttributes(), decisionTaskCompletedId);
        break;
      case RecordMarker:
        processRecordMarker(ctx, d.getRecordMarkerDecisionAttributes(), decisionTaskCompletedId);
        break;
      case RequestCancelExternalWorkflowExecution:
        processRequestCancelExternalWorkflowExecution(
            ctx, d.getRequestCancelExternalWorkflowExecutionDecisionAttributes());
        break;
      case UpsertWorkflowSearchAttributes:
        processUpsertWorkflowSearchAttributes(
            ctx, d.getUpsertWorkflowSearchAttributesDecisionAttributes(), decisionTaskCompletedId);
        break;
    }
  }

  private void processRequestCancelExternalWorkflowExecution(
      RequestContext ctx, RequestCancelExternalWorkflowExecutionDecisionAttributes attr) {
    ForkJoinPool.commonPool()
        .execute(
            () -> {
              RequestCancelWorkflowExecutionRequest request =
                  new RequestCancelWorkflowExecutionRequest();
              WorkflowExecution workflowExecution = new WorkflowExecution();
              workflowExecution.setWorkflowId(attr.workflowId);
              request.setWorkflowExecution(workflowExecution);
              request.setDomain(ctx.getDomain());
              try {
                service.RequestCancelWorkflowExecution(request);
              } catch (Exception e) {
                log.error("Failure to request cancel external workflow", e);
              }
            });
  }

  private void processRecordMarker(
      RequestContext ctx, RecordMarkerDecisionAttributes attr, long decisionTaskCompletedId)
      throws BadRequestError {
    if (!attr.isSetMarkerName()) {
      throw new BadRequestError("marker name is required");
    }

    MarkerRecordedEventAttributes marker =
        new MarkerRecordedEventAttributes()
            .setMarkerName(attr.getMarkerName())
            .setHeader(attr.getHeader())
            .setDetails(attr.getDetails())
            .setDecisionTaskCompletedEventId(decisionTaskCompletedId);
    HistoryEvent event =
        new HistoryEvent()
            .setEventType(EventType.MarkerRecorded)
            .setMarkerRecordedEventAttributes(marker);
    ctx.addEvent(event);
  }

  private void processCancelTimer(
      RequestContext ctx, CancelTimerDecisionAttributes d, long decisionTaskCompletedId)
      throws InternalServiceError, BadRequestError {
    String timerId = d.getTimerId();
    StateMachine<TimerData> timer = timers.get(timerId);
    if (timer == null) {
      CancelTimerFailedEventAttributes failedAttr =
          new CancelTimerFailedEventAttributes()
              .setTimerId(timerId)
              .setCause("TIMER_ID_UNKNOWN")
              .setDecisionTaskCompletedEventId(decisionTaskCompletedId);
      HistoryEvent cancellationFailed =
          new HistoryEvent()
              .setEventType(EventType.CancelTimerFailed)
              .setCancelTimerFailedEventAttributes(failedAttr);
      ctx.addEvent(cancellationFailed);
      return;
    }
    timer.action(StateMachines.Action.CANCEL, ctx, d, decisionTaskCompletedId);
    timers.remove(timerId);
  }

  private void processRequestCancelActivityTask(
      RequestContext ctx,
      RequestCancelActivityTaskDecisionAttributes a,
      long decisionTaskCompletedId)
      throws InternalServiceError, BadRequestError {
    String activityId = a.getActivityId();
    StateMachine<?> activity = activities.get(activityId);
    if (activity == null) {
      RequestCancelActivityTaskFailedEventAttributes failedAttr =
          new RequestCancelActivityTaskFailedEventAttributes()
              .setActivityId(activityId)
              .setCause("ACTIVITY_ID_UNKNOWN")
              .setDecisionTaskCompletedEventId(decisionTaskCompletedId);
      HistoryEvent cancellationFailed =
          new HistoryEvent()
              .setEventType(EventType.RequestCancelActivityTaskFailed)
              .setRequestCancelActivityTaskFailedEventAttributes(failedAttr);
      ctx.addEvent(cancellationFailed);
      return;
    }
    State beforeState = activity.getState();
    activity.action(StateMachines.Action.REQUEST_CANCELLATION, ctx, a, decisionTaskCompletedId);
    if (beforeState == StateMachines.State.INITIATED) {
      activity.action(StateMachines.Action.CANCEL, ctx, null, 0);
      activities.remove(activityId);
      ctx.setNeedDecision(true);
    }
  }

  private void processScheduleActivityTask(
      RequestContext ctx, ScheduleActivityTaskDecisionAttributes a, long decisionTaskCompletedId)
      throws BadRequestError, InternalServiceError {
    validateScheduleActivityTask(a);
    String activityId = a.getActivityId();
    StateMachine<ActivityTaskData> activity = activities.get(activityId);
    if (activity != null) {
      throw new BadRequestError("Already open activity with " + activityId);
    }
    activity = StateMachines.newActivityStateMachine(store, this.startRequest);
    activities.put(activityId, activity);
    activity.action(StateMachines.Action.INITIATE, ctx, a, decisionTaskCompletedId);
    ActivityTaskScheduledEventAttributes scheduledEvent = activity.getData().scheduledEvent;
    ctx.addTimer(
        scheduledEvent.getScheduleToCloseTimeoutSeconds(),
        () -> timeoutActivity(activityId, TimeoutType.SCHEDULE_TO_CLOSE),
        "Activity ScheduleToCloseTimeout");
    ctx.addTimer(
        scheduledEvent.getScheduleToStartTimeoutSeconds(),
        () -> timeoutActivity(activityId, TimeoutType.SCHEDULE_TO_START),
        "Activity ScheduleToStartTimeout");
    ctx.lockTimer();
  }

  private void validateScheduleActivityTask(ScheduleActivityTaskDecisionAttributes a)
      throws BadRequestError {
    if (a == null) {
      throw new BadRequestError("ScheduleActivityTaskDecisionAttributes is not set on decision.");
    }

    if (a.getTaskList() == null || a.getTaskList().getName().isEmpty()) {
      throw new BadRequestError("TaskList is not set on decision.");
    }
    if (a.getActivityId() == null || a.getActivityId().isEmpty()) {
      throw new BadRequestError("ActivityId is not set on decision.");
    }
    if (a.getActivityType() == null
        || a.getActivityType().getName() == null
        || a.getActivityType().getName().isEmpty()) {
      throw new BadRequestError("ActivityType is not set on decision.");
    }
    if (a.getStartToCloseTimeoutSeconds() <= 0) {
      throw new BadRequestError("A valid StartToCloseTimeoutSeconds is not set on decision.");
    }
    if (a.getScheduleToStartTimeoutSeconds() <= 0) {
      throw new BadRequestError("A valid ScheduleToStartTimeoutSeconds is not set on decision.");
    }
    if (a.getScheduleToCloseTimeoutSeconds() <= 0) {
      throw new BadRequestError("A valid ScheduleToCloseTimeoutSeconds is not set on decision.");
    }
    if (a.getHeartbeatTimeoutSeconds() < 0) {
      throw new BadRequestError("Ac valid HeartbeatTimeoutSeconds is not set on decision.");
    }
  }

  private void processStartChildWorkflow(
      RequestContext ctx,
      StartChildWorkflowExecutionDecisionAttributes a,
      long decisionTaskCompletedId)
      throws BadRequestError, InternalServiceError {
    validateStartChildExecutionAttributes(a);
    StateMachine<ChildWorkflowData> child = StateMachines.newChildWorkflowStateMachine(service);
    childWorkflows.put(ctx.getNextEventId(), child);
    child.action(StateMachines.Action.INITIATE, ctx, a, decisionTaskCompletedId);
    ctx.lockTimer();
  }

  /** Clone of the validateStartChildExecutionAttributes from historyEngine.go */
  private void validateStartChildExecutionAttributes(
      StartChildWorkflowExecutionDecisionAttributes a) throws BadRequestError {
    if (a == null) {
      throw new BadRequestError(
          "StartChildWorkflowExecutionDecisionAttributes is not set on decision.");
    }

    if (a.getWorkflowId().isEmpty()) {
      throw new BadRequestError("Required field WorkflowID is not set on decision.");
    }

    if (a.getWorkflowType() == null || a.getWorkflowType().getName().isEmpty()) {
      throw new BadRequestError("Required field WorkflowType is not set on decision.");
    }

    // Inherit tasklist from parent workflow execution if not provided on decision
    if (a.getTaskList() == null || a.getTaskList().getName().isEmpty()) {
      a.setTaskList(startRequest.getTaskList());
    }

    // Inherit workflow timeout from parent workflow execution if not provided on decision
    if (a.getExecutionStartToCloseTimeoutSeconds() <= 0) {
      a.setExecutionStartToCloseTimeoutSeconds(
          startRequest.getExecutionStartToCloseTimeoutSeconds());
    }

    // Inherit decision task timeout from parent workflow execution if not provided on decision
    if (a.getTaskStartToCloseTimeoutSeconds() <= 0) {
      a.setTaskStartToCloseTimeoutSeconds(startRequest.getTaskStartToCloseTimeoutSeconds());
    }

    RetryPolicy retryPolicy = a.getRetryPolicy();
    if (retryPolicy != null) {
      RetryState.validateRetryPolicy(retryPolicy);
    }
  }

  private void processSignalExternalWorkflowExecution(
      RequestContext ctx,
      SignalExternalWorkflowExecutionDecisionAttributes a,
      long decisionTaskCompletedId)
      throws InternalServiceError, BadRequestError {
    String signalId = UUID.randomUUID().toString();
    StateMachine<SignalExternalData> signalStateMachine =
        StateMachines.newSignalExternalStateMachine();
    externalSignals.put(signalId, signalStateMachine);
    signalStateMachine.action(StateMachines.Action.INITIATE, ctx, a, decisionTaskCompletedId);
    ForkJoinPool.commonPool()
        .execute(
            () -> {
              try {
                service.signalExternalWorkflowExecution(signalId, a, this);
              } catch (Exception e) {
                log.error("Failure signalling an external workflow execution", e);
              }
            });
    ctx.lockTimer();
  }

  @Override
  public void completeSignalExternalWorkflowExecution(String signalId, String runId)
      throws EntityNotExistsError, InternalServiceError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<SignalExternalData> signal = getSignal(signalId);
          signal.action(Action.COMPLETE, ctx, runId, 0);
          scheduleDecision(ctx);
          ctx.unlockTimer();
        });
  }

  @Override
  public void failSignalExternalWorkflowExecution(
      String signalId, SignalExternalWorkflowExecutionFailedCause cause)
      throws EntityNotExistsError, InternalServiceError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<SignalExternalData> signal = getSignal(signalId);
          signal.action(Action.FAIL, ctx, cause, 0);
          scheduleDecision(ctx);
          ctx.unlockTimer();
        });
  }

  private StateMachine<SignalExternalData> getSignal(String signalId) throws EntityNotExistsError {
    StateMachine<SignalExternalData> signal = externalSignals.get(signalId);
    if (signal == null) {
      throw new EntityNotExistsError("unknown signalId: " + signalId);
    }
    return signal;
  }

  // TODO: insert a single decision failure into the history
  @Override
  public void failDecisionTask(RespondDecisionTaskFailedRequest request)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    completeDecisionUpdate(
        ctx -> {
          decision.action(Action.FAIL, ctx, request, 0);
          scheduleDecision(ctx);
        },
        null); // reset sticky attributes to null
  }

  // TODO: insert a single decision timeout into the history
  private void timeoutDecisionTask(long scheduledEventId) {
    try {
      completeDecisionUpdate(
          ctx -> {
            if (decision == null
                || decision.getData().scheduledEventId != scheduledEventId
                || decision.getState() == State.COMPLETED) {
              // timeout for a previous decision
              return;
            }
            decision.action(StateMachines.Action.TIME_OUT, ctx, TimeoutType.START_TO_CLOSE, 0);
            scheduleDecision(ctx);
          },
          null); // reset sticky attributes to null
    } catch (EntityNotExistsError e) {
      // Expected as timers are not removed
    } catch (Exception e) {
      // Cannot fail to timer threads
      log.error("Failure trying to timeout a decision scheduledEventId=" + scheduledEventId, e);
    }
  }

  @Override
  public void childWorkflowStarted(ChildWorkflowExecutionStartedEventAttributes a)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<ChildWorkflowData> child = getChildWorkflow(a.getInitiatedEventId());
          child.action(StateMachines.Action.START, ctx, a, 0);
          scheduleDecision(ctx);
          // No need to lock until completion as child workflow might skip
          // time as well
          ctx.unlockTimer();
        });
  }

  @Override
  public void childWorkflowFailed(String activityId, ChildWorkflowExecutionFailedEventAttributes a)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<ChildWorkflowData> child = getChildWorkflow(a.getInitiatedEventId());
          child.action(StateMachines.Action.FAIL, ctx, a, 0);
          childWorkflows.remove(a.getInitiatedEventId());
          scheduleDecision(ctx);
          ctx.unlockTimer();
        });
  }

  @Override
  public void childWorkflowTimedOut(
      String activityId, ChildWorkflowExecutionTimedOutEventAttributes a)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<ChildWorkflowData> child = getChildWorkflow(a.getInitiatedEventId());
          child.action(Action.TIME_OUT, ctx, a.getTimeoutType(), 0);
          childWorkflows.remove(a.getInitiatedEventId());
          scheduleDecision(ctx);
          ctx.unlockTimer();
        });
  }

  @Override
  public void failStartChildWorkflow(
      String childId, StartChildWorkflowExecutionFailedEventAttributes a)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<ChildWorkflowData> child = getChildWorkflow(a.getInitiatedEventId());
          child.action(StateMachines.Action.FAIL, ctx, a, 0);
          childWorkflows.remove(a.getInitiatedEventId());
          scheduleDecision(ctx);
          ctx.unlockTimer();
        });
  }

  @Override
  public void childWorkflowCompleted(
      String activityId, ChildWorkflowExecutionCompletedEventAttributes a)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<ChildWorkflowData> child = getChildWorkflow(a.getInitiatedEventId());
          child.action(StateMachines.Action.COMPLETE, ctx, a, 0);
          childWorkflows.remove(a.getInitiatedEventId());
          scheduleDecision(ctx);
          ctx.unlockTimer();
        });
  }

  @Override
  public void childWorkflowCanceled(
      String activityId, ChildWorkflowExecutionCanceledEventAttributes a)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<ChildWorkflowData> child = getChildWorkflow(a.getInitiatedEventId());
          child.action(StateMachines.Action.CANCEL, ctx, a, 0);
          childWorkflows.remove(a.getInitiatedEventId());
          scheduleDecision(ctx);
          ctx.unlockTimer();
        });
  }

  private void processStartTimer(
      RequestContext ctx, StartTimerDecisionAttributes a, long decisionTaskCompletedId)
      throws BadRequestError, InternalServiceError {
    String timerId = a.getTimerId();
    if (timerId == null) {
      throw new BadRequestError("A valid TimerId is not set on StartTimerDecision");
    }
    StateMachine<TimerData> timer = timers.get(timerId);
    if (timer != null) {
      throw new BadRequestError("Already open timer with " + timerId);
    }
    timer = StateMachines.newTimerStateMachine();
    timers.put(timerId, timer);
    timer.action(StateMachines.Action.START, ctx, a, decisionTaskCompletedId);
    ctx.addTimer(a.getStartToFireTimeoutSeconds(), () -> fireTimer(timerId), "fire timer");
  }

  private void fireTimer(String timerId) {
    StateMachine<TimerData> timer;
    lock.lock();
    try {
      {
        timer = timers.get(timerId);
        if (timer == null || workflow.getState() != State.STARTED) {
          return; // cancelled already
        }
      }
    } finally {
      lock.unlock();
    }
    try {
      update(
          ctx -> {
            timer.action(StateMachines.Action.COMPLETE, ctx, null, 0);
            timers.remove(timerId);
            scheduleDecision(ctx);
          });
    } catch (BadRequestError
        | InternalServiceError
        | EntityNotExistsError
        | WorkflowExecutionAlreadyCompletedError e) {
      // Cannot fail to timer threads
      log.error("Failure firing a timer", e);
    }
  }

  private void processFailWorkflowExecution(
      RequestContext ctx,
      FailWorkflowExecutionDecisionAttributes d,
      long decisionTaskCompletedId,
      String identity)
      throws InternalServiceError, BadRequestError {
    WorkflowData data = workflow.getData();
    if (data.retryState.isPresent()) {
      RetryState rs = data.retryState.get();
      int backoffIntervalSeconds =
          rs.getBackoffIntervalInSeconds(d.getReason(), store.currentTimeMillis());
      if (backoffIntervalSeconds > 0) {
        ContinueAsNewWorkflowExecutionDecisionAttributes continueAsNewAttr =
            new ContinueAsNewWorkflowExecutionDecisionAttributes()
                .setInput(startRequest.getInput())
                .setWorkflowType(startRequest.getWorkflowType())
                .setExecutionStartToCloseTimeoutSeconds(
                    startRequest.getExecutionStartToCloseTimeoutSeconds())
                .setTaskStartToCloseTimeoutSeconds(startRequest.getTaskStartToCloseTimeoutSeconds())
                .setTaskList(startRequest.getTaskList())
                .setBackoffStartIntervalInSeconds(backoffIntervalSeconds)
                .setRetryPolicy(startRequest.getRetryPolicy());
        workflow.action(Action.CONTINUE_AS_NEW, ctx, continueAsNewAttr, decisionTaskCompletedId);
        HistoryEvent event = ctx.getEvents().get(ctx.getEvents().size() - 1);
        WorkflowExecutionContinuedAsNewEventAttributes continuedAsNewEventAttributes =
            event.getWorkflowExecutionContinuedAsNewEventAttributes();

        Optional<RetryState> continuedRetryState = Optional.of(rs.getNextAttempt());
        String runId =
            service.continueAsNew(
                startRequest,
                continuedAsNewEventAttributes,
                continuedRetryState,
                identity,
                getExecutionId(),
                parent,
                parentChildInitiatedEventId);
        continuedAsNewEventAttributes.setNewExecutionRunId(runId);
        return;
      }
    }

    if (!Strings.isNullOrEmpty(data.cronSchedule)) {
      startNewCronRun(ctx, decisionTaskCompletedId, identity, data, data.lastCompletionResult);
      return;
    }

    workflow.action(StateMachines.Action.FAIL, ctx, d, decisionTaskCompletedId);
    if (parent.isPresent()) {
      ctx.lockTimer(); // unlocked by the parent
      ChildWorkflowExecutionFailedEventAttributes a =
          new ChildWorkflowExecutionFailedEventAttributes()
              .setInitiatedEventId(parentChildInitiatedEventId.getAsLong())
              .setDetails(d.getDetails())
              .setReason(d.getReason())
              .setWorkflowType(startRequest.getWorkflowType())
              .setDomain(ctx.getDomain())
              .setWorkflowExecution(ctx.getExecution());
      ForkJoinPool.commonPool()
          .execute(
              () -> {
                try {
                  parent
                      .get()
                      .childWorkflowFailed(ctx.getExecutionId().getWorkflowId().getWorkflowId(), a);
                } catch (EntityNotExistsError | WorkflowExecutionAlreadyCompletedError e) {
                  // Parent might already close
                } catch (BadRequestError | InternalServiceError e) {
                  log.error("Failure reporting child completion", e);
                }
              });
    }
  }

  private void processCompleteWorkflowExecution(
      RequestContext ctx,
      CompleteWorkflowExecutionDecisionAttributes d,
      long decisionTaskCompletedId,
      String identity)
      throws InternalServiceError, BadRequestError {
    WorkflowData data = workflow.getData();
    if (!Strings.isNullOrEmpty(data.cronSchedule)) {
      startNewCronRun(ctx, decisionTaskCompletedId, identity, data, d.getResult());
      return;
    }

    workflow.action(StateMachines.Action.COMPLETE, ctx, d, decisionTaskCompletedId);
    if (parent.isPresent()) {
      ctx.lockTimer(); // unlocked by the parent
      ChildWorkflowExecutionCompletedEventAttributes a =
          new ChildWorkflowExecutionCompletedEventAttributes()
              .setInitiatedEventId(parentChildInitiatedEventId.getAsLong())
              .setResult(d.getResult())
              .setDomain(ctx.getDomain())
              .setWorkflowExecution(ctx.getExecution())
              .setWorkflowType(startRequest.getWorkflowType());
      ForkJoinPool.commonPool()
          .execute(
              () -> {
                try {
                  parent
                      .get()
                      .childWorkflowCompleted(
                          ctx.getExecutionId().getWorkflowId().getWorkflowId(), a);
                } catch (EntityNotExistsError | WorkflowExecutionAlreadyCompletedError e) {
                  // Parent might already close
                } catch (BadRequestError | InternalServiceError e) {
                  log.error("Failure reporting child completion", e);
                }
              });
    }
  }

  private void startNewCronRun(
      RequestContext ctx,
      long decisionTaskCompletedId,
      String identity,
      WorkflowData data,
      byte[] lastCompletionResult)
      throws InternalServiceError, BadRequestError {
    CronDefinition cronDefinition = CronDefinitionBuilder.instanceDefinitionFor(CronType.UNIX);
    CronParser parser = new CronParser(cronDefinition);
    Cron cron = parser.parse(data.cronSchedule);

    Instant i = Instant.ofEpochMilli(store.currentTimeMillis());
    ZonedDateTime now = ZonedDateTime.ofInstant(i, ZoneOffset.UTC);

    ExecutionTime executionTime = ExecutionTime.forCron(cron);
    Optional<Duration> backoff = executionTime.timeToNextExecution(now);
    int backoffIntervalSeconds = (int) backoff.get().getSeconds();

    if (backoffIntervalSeconds == 0) {
      backoff = executionTime.timeToNextExecution(now.plusSeconds(1));
      backoffIntervalSeconds = (int) backoff.get().getSeconds() + 1;
    }

    ContinueAsNewWorkflowExecutionDecisionAttributes continueAsNewAttr =
        new ContinueAsNewWorkflowExecutionDecisionAttributes()
            .setInput(startRequest.getInput())
            .setWorkflowType(startRequest.getWorkflowType())
            .setExecutionStartToCloseTimeoutSeconds(
                startRequest.getExecutionStartToCloseTimeoutSeconds())
            .setTaskStartToCloseTimeoutSeconds(startRequest.getTaskStartToCloseTimeoutSeconds())
            .setTaskList(startRequest.getTaskList())
            .setBackoffStartIntervalInSeconds(backoffIntervalSeconds)
            .setRetryPolicy(startRequest.getRetryPolicy())
            .setLastCompletionResult(lastCompletionResult);
    workflow.action(Action.CONTINUE_AS_NEW, ctx, continueAsNewAttr, decisionTaskCompletedId);
    HistoryEvent event = ctx.getEvents().get(ctx.getEvents().size() - 1);
    WorkflowExecutionContinuedAsNewEventAttributes continuedAsNewEventAttributes =
        event.getWorkflowExecutionContinuedAsNewEventAttributes();

    String runId =
        service.continueAsNew(
            startRequest,
            continuedAsNewEventAttributes,
            Optional.empty(),
            identity,
            getExecutionId(),
            parent,
            parentChildInitiatedEventId);
    continuedAsNewEventAttributes.setNewExecutionRunId(runId);
  }

  private void processCancelWorkflowExecution(
      RequestContext ctx, CancelWorkflowExecutionDecisionAttributes d, long decisionTaskCompletedId)
      throws InternalServiceError, BadRequestError {
    workflow.action(StateMachines.Action.CANCEL, ctx, d, decisionTaskCompletedId);
    if (parent.isPresent()) {
      ctx.lockTimer(); // unlocked by the parent
      ChildWorkflowExecutionCanceledEventAttributes a =
          new ChildWorkflowExecutionCanceledEventAttributes()
              .setInitiatedEventId(parentChildInitiatedEventId.getAsLong())
              .setDetails(d.getDetails())
              .setDomain(ctx.getDomain())
              .setWorkflowExecution(ctx.getExecution())
              .setWorkflowType(startRequest.getWorkflowType());
      ForkJoinPool.commonPool()
          .execute(
              () -> {
                try {
                  parent
                      .get()
                      .childWorkflowCanceled(
                          ctx.getExecutionId().getWorkflowId().getWorkflowId(), a);
                } catch (EntityNotExistsError | WorkflowExecutionAlreadyCompletedError e) {
                  // Parent might already close
                } catch (BadRequestError | InternalServiceError e) {
                  log.error("Failure reporting child completion", e);
                }
              });
    }
  }

  private void processContinueAsNewWorkflowExecution(
      RequestContext ctx,
      ContinueAsNewWorkflowExecutionDecisionAttributes d,
      long decisionTaskCompletedId,
      String identity)
      throws InternalServiceError, BadRequestError {
    workflow.action(Action.CONTINUE_AS_NEW, ctx, d, decisionTaskCompletedId);
    HistoryEvent event = ctx.getEvents().get(ctx.getEvents().size() - 1);
    String runId =
        service.continueAsNew(
            startRequest,
            event.getWorkflowExecutionContinuedAsNewEventAttributes(),
            workflow.getData().retryState,
            identity,
            getExecutionId(),
            parent,
            parentChildInitiatedEventId);
    event.getWorkflowExecutionContinuedAsNewEventAttributes().setNewExecutionRunId(runId);
  }

  private void processUpsertWorkflowSearchAttributes(
      RequestContext ctx,
      UpsertWorkflowSearchAttributesDecisionAttributes attr,
      long decisionTaskCompletedId)
      throws BadRequestError, InternalServiceError {
    UpsertWorkflowSearchAttributesEventAttributes upsertEventAttr =
        new UpsertWorkflowSearchAttributesEventAttributes()
            .setSearchAttributes(attr.getSearchAttributes())
            .setDecisionTaskCompletedEventId(decisionTaskCompletedId);
    HistoryEvent event =
        new HistoryEvent()
            .setEventType(EventType.UpsertWorkflowSearchAttributes)
            .setUpsertWorkflowSearchAttributesEventAttributes(upsertEventAttr);
    ctx.addEvent(event);
  }

  @Override
  public void startWorkflow(
      boolean continuedAsNew, Optional<SignalWorkflowExecutionRequest> signalWithStartSignal)
      throws InternalServiceError, BadRequestError {
    try {
      update(
          ctx -> {
            workflow.action(StateMachines.Action.START, ctx, startRequest, 0);
            if (signalWithStartSignal.isPresent()) {
              addExecutionSignaledEvent(ctx, signalWithStartSignal.get());
            }
            int backoffStartIntervalInSeconds = workflow.getData().backoffStartIntervalInSeconds;
            if (backoffStartIntervalInSeconds > 0) {
              ctx.addTimer(
                  backoffStartIntervalInSeconds,
                  () -> {
                    try {
                      update(ctx1 -> scheduleDecision(ctx1));
                    } catch (EntityNotExistsError e) {
                      // Expected as timers are not removed
                    } catch (Exception e) {
                      // Cannot fail to timer threads
                      log.error("Failure trying to add task for an delayed workflow retry", e);
                    }
                  },
                  "delayedFirstDecision");
            } else {
              scheduleDecision(ctx);
            }

            int executionTimeoutTimerDelay = startRequest.getExecutionStartToCloseTimeoutSeconds();
            if (backoffStartIntervalInSeconds > 0) {
              executionTimeoutTimerDelay =
                  executionTimeoutTimerDelay + backoffStartIntervalInSeconds;
            }
            ctx.addTimer(
                executionTimeoutTimerDelay, this::timeoutWorkflow, "workflow execution timeout");
          });
    } catch (EntityNotExistsError | WorkflowExecutionAlreadyCompletedError e) {
      throw new InternalServiceError(Throwables.getStackTraceAsString(e));
    }
    if (!continuedAsNew && parent.isPresent()) {
      ChildWorkflowExecutionStartedEventAttributes a =
          new ChildWorkflowExecutionStartedEventAttributes()
              .setInitiatedEventId(parentChildInitiatedEventId.getAsLong())
              .setWorkflowExecution(getExecutionId().getExecution())
              .setDomain(getExecutionId().getDomain())
              .setWorkflowType(startRequest.getWorkflowType());
      ForkJoinPool.commonPool()
          .execute(
              () -> {
                try {
                  parent.get().childWorkflowStarted(a);
                } catch (EntityNotExistsError | WorkflowExecutionAlreadyCompletedError e) {
                  // Not a problem. Parent might just close by now.
                } catch (BadRequestError | InternalServiceError e) {
                  log.error("Failure reporting child completion", e);
                }
              });
    }
  }

  private void scheduleDecision(RequestContext ctx) throws InternalServiceError, BadRequestError {
    if (decision != null) {
      if (decision.getState() == StateMachines.State.INITIATED) {
        return; // No need to schedule again
      }
      if (decision.getState() == StateMachines.State.STARTED) {
        ctx.setNeedDecision(true);
        return;
      }
      if (decision.getState() == StateMachines.State.FAILED
          || decision.getState() == StateMachines.State.COMPLETED
          || decision.getState() == State.TIMED_OUT) {
        decision.action(StateMachines.Action.INITIATE, ctx, startRequest, 0);
        ctx.lockTimer();
        return;
      }
      throw new InternalServiceError("unexpected decision state: " + decision.getState());
    }
    this.decision = StateMachines.newDecisionStateMachine(lastNonFailedDecisionStartEventId, store);
    decision.action(StateMachines.Action.INITIATE, ctx, startRequest, 0);
    ctx.lockTimer();
  }

  @Override
  public void startActivityTask(
      PollForActivityTaskResponse task, PollForActivityTaskRequest pollRequest)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          String activityId = task.getActivityId();
          StateMachine<ActivityTaskData> activity = getActivity(activityId);
          activity.action(StateMachines.Action.START, ctx, pollRequest, 0);
          ActivityTaskData data = activity.getData();
          int startToCloseTimeout = data.scheduledEvent.getStartToCloseTimeoutSeconds();
          int heartbeatTimeout = data.scheduledEvent.getHeartbeatTimeoutSeconds();
          if (startToCloseTimeout > 0) {
            ctx.addTimer(
                startToCloseTimeout,
                () -> timeoutActivity(activityId, TimeoutType.START_TO_CLOSE),
                "Activity StartToCloseTimeout");
          }
          updateHeartbeatTimer(ctx, activityId, activity, startToCloseTimeout, heartbeatTimeout);
        });
  }

  private void checkCompleted()
      throws EntityNotExistsError, WorkflowExecutionAlreadyCompletedError {
    State workflowState = workflow.getState();
    if (isTerminalState(workflowState)) {
      throw new WorkflowExecutionAlreadyCompletedError(
          "Workflow is already completed: " + workflowState);
    }
  }

  private boolean isTerminalState(State workflowState) {
    return workflowState == State.COMPLETED
        || workflowState == State.TIMED_OUT
        || workflowState == State.FAILED
        || workflowState == State.CANCELED
        || workflowState == State.CONTINUED_AS_NEW;
  }

  private void updateHeartbeatTimer(
      RequestContext ctx,
      String activityId,
      StateMachine<ActivityTaskData> activity,
      int startToCloseTimeout,
      int heartbeatTimeout) {
    if (heartbeatTimeout > 0 && heartbeatTimeout < startToCloseTimeout) {
      activity.getData().lastHeartbeatTime = clock.getAsLong();
      ctx.addTimer(
          heartbeatTimeout,
          () -> timeoutActivity(activityId, TimeoutType.HEARTBEAT),
          "Activity Heartbeat Timeout");
    }
  }

  @Override
  public void completeActivityTask(String activityId, RespondActivityTaskCompletedRequest request)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<?> activity = getActivity(activityId);
          activity.action(StateMachines.Action.COMPLETE, ctx, request, 0);
          activities.remove(activityId);
          scheduleDecision(ctx);
          ctx.unlockTimer();
        });
  }

  @Override
  public void completeActivityTaskById(
      String activityId, RespondActivityTaskCompletedByIDRequest request)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<?> activity = getActivity(activityId);
          activity.action(StateMachines.Action.COMPLETE, ctx, request, 0);
          activities.remove(activityId);
          scheduleDecision(ctx);
          ctx.unlockTimer();
        });
  }

  @Override
  public void failActivityTask(String activityId, RespondActivityTaskFailedRequest request)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<ActivityTaskData> activity = getActivity(activityId);
          activity.action(StateMachines.Action.FAIL, ctx, request, 0);
          if (isTerminalState(activity.getState())) {
            activities.remove(activityId);
            scheduleDecision(ctx);
          } else {
            addActivityRetryTimer(ctx, activity);
          }
          // Allow time skipping when waiting for retry
          ctx.unlockTimer();
        });
  }

  private void addActivityRetryTimer(RequestContext ctx, StateMachine<ActivityTaskData> activity) {
    ActivityTaskData data = activity.getData();
    int attempt = data.retryState.getAttempt();
    ctx.addTimer(
        data.nextBackoffIntervalSeconds,
        () -> {
          // Timers are not removed, so skip if it is not for this attempt.
          if (activity.getState() != State.INITIATED && data.retryState.getAttempt() != attempt) {
            return;
          }
          selfAdvancingTimer.lockTimeSkipping(
              "activityRetryTimer " + activity.getData().scheduledEvent.getActivityId());
          boolean unlockTimer = false;
          try {
            update(ctx1 -> ctx1.addActivityTask(data.activityTask));
          } catch (EntityNotExistsError | WorkflowExecutionAlreadyCompletedError e) {
            unlockTimer = true;
            // Expected as timers are not removed
          } catch (Exception e) {
            unlockTimer = true;
            // Cannot fail to timer threads
            log.error("Failure trying to add task for an activity retry", e);
          } finally {
            if (unlockTimer) {
              // Allow time skipping when waiting for an activity retry
              selfAdvancingTimer.unlockTimeSkipping(
                  "activityRetryTimer " + activity.getData().scheduledEvent.getActivityId());
            }
          }
        },
        "Activity Retry");
  }

  @Override
  public void failActivityTaskById(String activityId, RespondActivityTaskFailedByIDRequest request)
      throws EntityNotExistsError, InternalServiceError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<ActivityTaskData> activity = getActivity(activityId);
          activity.action(StateMachines.Action.FAIL, ctx, request, 0);
          if (isTerminalState(activity.getState())) {
            activities.remove(activityId);
            scheduleDecision(ctx);
          } else {
            addActivityRetryTimer(ctx, activity);
          }
          ctx.unlockTimer();
        });
  }

  @Override
  public void cancelActivityTask(String activityId, RespondActivityTaskCanceledRequest request)
      throws EntityNotExistsError, InternalServiceError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<?> activity = getActivity(activityId);
          activity.action(StateMachines.Action.CANCEL, ctx, request, 0);
          activities.remove(activityId);
          scheduleDecision(ctx);
          ctx.unlockTimer();
        });
  }

  @Override
  public void cancelActivityTaskById(
      String activityId, RespondActivityTaskCanceledByIDRequest request)
      throws EntityNotExistsError, InternalServiceError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          StateMachine<?> activity = getActivity(activityId);
          activity.action(StateMachines.Action.CANCEL, ctx, request, 0);
          activities.remove(activityId);
          scheduleDecision(ctx);
          ctx.unlockTimer();
        });
  }

  @Override
  public RecordActivityTaskHeartbeatResponse heartbeatActivityTask(
      String activityId, byte[] details)
      throws InternalServiceError, EntityNotExistsError, WorkflowExecutionAlreadyCompletedError {
    RecordActivityTaskHeartbeatResponse result = new RecordActivityTaskHeartbeatResponse();
    try {
      update(
          ctx -> {
            StateMachine<ActivityTaskData> activity = getActivity(activityId);
            activity.action(StateMachines.Action.UPDATE, ctx, details, 0);
            if (activity.getState() == StateMachines.State.CANCELLATION_REQUESTED) {
              result.setCancelRequested(true);
            }
            ActivityTaskData data = activity.getData();
            data.lastHeartbeatTime = clock.getAsLong();
            int startToCloseTimeout = data.scheduledEvent.getStartToCloseTimeoutSeconds();
            int heartbeatTimeout = data.scheduledEvent.getHeartbeatTimeoutSeconds();
            updateHeartbeatTimer(ctx, activityId, activity, startToCloseTimeout, heartbeatTimeout);
          });

    } catch (InternalServiceError
        | EntityNotExistsError
        | WorkflowExecutionAlreadyCompletedError e) {
      throw e;
    } catch (Exception e) {
      throw new InternalServiceError(Throwables.getStackTraceAsString(e));
    }
    return result;
  }

  private void timeoutActivity(String activityId, TimeoutType timeoutType) {
    boolean unlockTimer = true;
    try {
      update(
          ctx -> {
            StateMachine<ActivityTaskData> activity = getActivity(activityId);
            if (timeoutType == TimeoutType.SCHEDULE_TO_START
                && activity.getState() != StateMachines.State.INITIATED) {
              throw new EntityNotExistsError("Not in INITIATED");
            }
            if (timeoutType == TimeoutType.HEARTBEAT) {
              // Deal with timers which are never cancelled
              long heartbeatTimeout =
                  TimeUnit.SECONDS.toMillis(
                      activity.getData().scheduledEvent.getHeartbeatTimeoutSeconds());
              if (clock.getAsLong() - activity.getData().lastHeartbeatTime < heartbeatTimeout) {
                throw new EntityNotExistsError("Not heartbeat timeout");
              }
            }
            activity.action(StateMachines.Action.TIME_OUT, ctx, timeoutType, 0);
            if (isTerminalState(activity.getState())) {
              activities.remove(activityId);
              scheduleDecision(ctx);
            } else {
              addActivityRetryTimer(ctx, activity);
            }
          });
    } catch (EntityNotExistsError | WorkflowExecutionAlreadyCompletedError e) {
      // Expected as timers are not removed
      unlockTimer = false;
    } catch (Exception e) {
      // Cannot fail to timer threads
      log.error("Failure trying to timeout an activity", e);
    } finally {
      if (unlockTimer) {
        selfAdvancingTimer.unlockTimeSkipping("timeoutActivity " + activityId);
      }
    }
  }

  private void timeoutWorkflow() {
    lock.lock();
    try {
      {
        if (isTerminalState(workflow.getState())) {
          return;
        }
      }
    } finally {
      lock.unlock();
    }
    try {
      update(
          ctx -> {
            if (isTerminalState(workflow.getState())) {
              return;
            }
            workflow.action(StateMachines.Action.TIME_OUT, ctx, TimeoutType.START_TO_CLOSE, 0);
            if (parent != null) {
              ctx.lockTimer(); // unlocked by the parent
            }
            ForkJoinPool.commonPool().execute(() -> reportWorkflowTimeoutToParent(ctx));
          });
    } catch (BadRequestError
        | InternalServiceError
        | EntityNotExistsError
        | WorkflowExecutionAlreadyCompletedError e) {
      // Cannot fail to timer threads
      log.error("Failure trying to timeout a workflow", e);
    }
  }

  private void reportWorkflowTimeoutToParent(RequestContext ctx) {
    if (!parent.isPresent()) {
      return;
    }
    try {
      ChildWorkflowExecutionTimedOutEventAttributes a =
          new ChildWorkflowExecutionTimedOutEventAttributes()
              .setInitiatedEventId(parentChildInitiatedEventId.getAsLong())
              .setTimeoutType(TimeoutType.START_TO_CLOSE)
              .setWorkflowType(startRequest.getWorkflowType())
              .setDomain(ctx.getDomain())
              .setWorkflowExecution(ctx.getExecution());
      parent.get().childWorkflowTimedOut(ctx.getExecutionId().getWorkflowId().getWorkflowId(), a);
    } catch (EntityNotExistsError | WorkflowExecutionAlreadyCompletedError e) {
      // Parent might already close
    } catch (BadRequestError | InternalServiceError e) {
      log.error("Failure reporting child timing out", e);
    }
  }

  @Override
  public void signal(SignalWorkflowExecutionRequest signalRequest)
      throws EntityNotExistsError, InternalServiceError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          addExecutionSignaledEvent(ctx, signalRequest);
          scheduleDecision(ctx);
        });
  }

  @Override
  public void signalFromWorkflow(SignalExternalWorkflowExecutionDecisionAttributes a)
      throws EntityNotExistsError, InternalServiceError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          addExecutionSignaledByExternalEvent(ctx, a);
          scheduleDecision(ctx);
        });
  }

  @Override
  public void requestCancelWorkflowExecution(RequestCancelWorkflowExecutionRequest cancelRequest)
      throws EntityNotExistsError, InternalServiceError, WorkflowExecutionAlreadyCompletedError,
          BadRequestError {
    update(
        ctx -> {
          workflow.action(StateMachines.Action.REQUEST_CANCELLATION, ctx, cancelRequest, 0);
          scheduleDecision(ctx);
        });
  }

  @Override
  public QueryWorkflowResponse query(QueryWorkflowRequest queryRequest) throws TException {
    QueryId queryId = new QueryId(executionId);

    Optional<WorkflowExecutionCloseStatus> optCloseStatus = getCloseStatus();
    if (optCloseStatus.isPresent() && queryRequest.getQueryRejectCondition() != null) {
      WorkflowExecutionCloseStatus closeStatus = optCloseStatus.get();
      boolean rejectNotOpen =
          queryRequest.getQueryRejectCondition() == QueryRejectCondition.NOT_OPEN;
      boolean rejectNotCompletedCleanly =
          queryRequest.getQueryRejectCondition() == QueryRejectCondition.NOT_COMPLETED_CLEANLY
              && closeStatus != WorkflowExecutionCloseStatus.COMPLETED;
      if (rejectNotOpen || rejectNotCompletedCleanly) {
        return new QueryWorkflowResponse()
            .setQueryRejected(new QueryRejected().setCloseStatus(closeStatus));
      }
    }

    CompletableFuture<QueryWorkflowResponse> result = new CompletableFuture<>();
    queries.put(queryId.getQueryId(), result);

    if (queryRequest.getQueryConsistencyLevel() == QueryConsistencyLevel.STRONG) {
      pendingQueries.put(queryId.getQueryId(), queryRequest.getQuery());
    } else {
      PollForDecisionTaskResponse task =
          new PollForDecisionTaskResponse()
              .setTaskToken(queryId.toBytes())
              .setWorkflowExecution(executionId.getExecution())
              .setWorkflowType(startRequest.getWorkflowType())
              .setQuery(queryRequest.getQuery())
              .setWorkflowExecutionTaskList(startRequest.getTaskList());
      TaskListId taskListId =
          new TaskListId(
              queryRequest.getDomain(),
              stickyExecutionAttributes == null
                  ? startRequest.getTaskList().getName()
                  : stickyExecutionAttributes.getWorkerTaskList().getName());
      queryRequests.put(queryId.getQueryId(), task);
      store.sendQueryTask(executionId, taskListId, task);
    }

    try {
      return result.get();
    } catch (InterruptedException e) {
      return new QueryWorkflowResponse();
    } catch (ExecutionException e) {
      Throwable cause = e.getCause();
      if (cause instanceof TException) {
        throw (TException) cause;
      }
      throw new InternalServiceError(Throwables.getStackTraceAsString(cause));
    }
  }

  @Override
  public void completeQuery(QueryId queryId, RespondQueryTaskCompletedRequest completeRequest)
      throws EntityNotExistsError {
    CompletableFuture<QueryWorkflowResponse> result = queries.get(queryId.getQueryId());
    if (result == null) {
      throw new EntityNotExistsError("Unknown query id: " + queryId.getQueryId());
    }
    if (completeRequest.getCompletedType() == QueryTaskCompletedType.COMPLETED) {
      QueryWorkflowResponse response =
          new QueryWorkflowResponse().setQueryResult(completeRequest.getQueryResult());
      result.complete(response);
    } else if (stickyExecutionAttributes != null) {
      stickyExecutionAttributes = null;
      PollForDecisionTaskResponse task = queryRequests.remove(queryId.getQueryId());

      TaskListId taskListId =
          new TaskListId(startRequest.getDomain(), startRequest.getTaskList().getName());
      store.sendQueryTask(executionId, taskListId, task);
    } else {
      QueryFailedError error = new QueryFailedError().setMessage(completeRequest.getErrorMessage());
      result.completeExceptionally(error);
    }
  }

  private void addExecutionSignaledEvent(
      RequestContext ctx, SignalWorkflowExecutionRequest signalRequest) {
    WorkflowExecutionSignaledEventAttributes a =
        new WorkflowExecutionSignaledEventAttributes()
            .setInput(startRequest.getInput())
            .setIdentity(signalRequest.getIdentity())
            .setInput(signalRequest.getInput())
            .setSignalName(signalRequest.getSignalName());
    HistoryEvent executionSignaled =
        new HistoryEvent()
            .setEventType(EventType.WorkflowExecutionSignaled)
            .setWorkflowExecutionSignaledEventAttributes(a);
    ctx.addEvent(executionSignaled);
  }

  private void addExecutionSignaledByExternalEvent(
      RequestContext ctx, SignalExternalWorkflowExecutionDecisionAttributes d) {
    WorkflowExecutionSignaledEventAttributes a =
        new WorkflowExecutionSignaledEventAttributes()
            .setInput(startRequest.getInput())
            .setInput(d.getInput())
            .setSignalName(d.getSignalName());
    HistoryEvent executionSignaled =
        new HistoryEvent()
            .setEventType(EventType.WorkflowExecutionSignaled)
            .setWorkflowExecutionSignaledEventAttributes(a);
    ctx.addEvent(executionSignaled);
  }

  private StateMachine<ActivityTaskData> getActivity(String activityId)
      throws EntityNotExistsError {
    StateMachine<ActivityTaskData> activity = activities.get(activityId);
    if (activity == null) {
      throw new EntityNotExistsError("unknown activityId: " + activityId);
    }
    return activity;
  }

  private StateMachine<ChildWorkflowData> getChildWorkflow(long initiatedEventId)
      throws InternalServiceError {
    StateMachine<ChildWorkflowData> child = childWorkflows.get(initiatedEventId);
    if (child == null) {
      throw new InternalServiceError("unknown initiatedEventId: " + initiatedEventId);
    }
    return child;
  }

  static class QueryId {

    private final ExecutionId executionId;
    private final String queryId;

    QueryId(ExecutionId executionId) {
      this.executionId = Objects.requireNonNull(executionId);
      this.queryId = UUID.randomUUID().toString();
    }

    private QueryId(ExecutionId executionId, String queryId) {
      this.executionId = Objects.requireNonNull(executionId);
      this.queryId = queryId;
    }

    public ExecutionId getExecutionId() {
      return executionId;
    }

    String getQueryId() {
      return queryId;
    }

    byte[] toBytes() throws InternalServiceError {
      ByteArrayOutputStream bout = new ByteArrayOutputStream();
      DataOutputStream out = new DataOutputStream(bout);
      addBytes(out);
      return bout.toByteArray();
    }

    void addBytes(DataOutputStream out) throws InternalServiceError {
      try {
        executionId.addBytes(out);
        out.writeUTF(queryId);
      } catch (IOException e) {
        throw new InternalServiceError(Throwables.getStackTraceAsString(e));
      }
    }

    static QueryId fromBytes(byte[] serialized) throws InternalServiceError {
      ByteArrayInputStream bin = new ByteArrayInputStream(serialized);
      DataInputStream in = new DataInputStream(bin);
      try {
        ExecutionId executionId = ExecutionId.readFromBytes(in);
        String queryId = in.readUTF();
        return new QueryId(executionId, queryId);
      } catch (IOException e) {
        throw new InternalServiceError(Throwables.getStackTraceAsString(e));
      }
    }
  }
}

uber / cadence-java-client / 1991

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